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A screen at the New York Stock Exchange shows the Dow Jones Industrial Average, top left, dip below 10,000 on Aug. 25. One week later, on Wednesday, Sept. 1, the Dow opened 130 points above the previous night's close. Neither a dip nor a jump in a market index reflects the true state of the economy.

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What passes for business reporting in the United States is too often a series of breathless reports about the stock market. When the Dow rises precipitously, as it did today (Wednesday), the business press predicts an end to the Great Recession. When the stock market plummets, as it did last week, the Great Recession is said to be worsening.

Pay no attention. The stock market has as much to do with the real economy as the weather has to do with geology. Day by day there’s no relationship at all. Over time, weather and geology interact but the results aren’t evident for many years. The biggest impact of the weather is on peoples’ moods, as are the daily ups and downs of the market.

Today’s rally was triggered by news that one of China’s official measures of its growth – its Purchasing Managers Index – rose. The index had been in decline for three straight months.

Why should an obscure measurement on the other side of the world cause stock markets in New York, London, and Frankfurt to rally? Because China is so large and its needs seemingly limitless that its growth has been about the only reliable source of global demand.

Many big American companies have been showing profits because they’re doing ever more business in China while cutting payrolls at home. American consumers aren’t buying much of anything because they’ve lost their jobs or are worried about losing them, and are still trying to get out from under a huge debt load (the latest figures show more consumer debt delinquent now than last year and a surge in personal bankruptcies). The U.S. housing market is growing worse, auto and retail sales are dropping, and the ranks of the jobless continue to swell.

Europe is in almost as much a mess. The problem there isn’t just or even mainly that Greece and other nations on the “periphery” have too much public debt. A bigger problem is European consumers aren’t buying nearly enough to generate more jobs. Unemployment remains high, and the trend is bad. Manufacturing growth there has slowed to its weakest pace in six months. Yet bizarrely, Europe’s large economies – Britain, Germany, and France – are paring back their public budgets. It’s exactly the wrong time, and a recipe for disaster.

Germany’s so-called “job miracle” (as Chancellor Angela Merkel calls it) is more mirage than miracle. Most of the gains in employment there have come from part-time jobs, often at low pay. Average annual net income per German employee continues to drop. This explains why domestic demand there is so sluggish and why Germany is desperately dependent on its exports of machinery and manufacturing components to Asia, especially China.

Meanwhile, Japan, now the world’s third-largest economy, is a basket case. Japanese consumers aren’t buying much of anything, and why would they? The country is still in the grip of a deflationary cycle that shows no end. Japanese consumers reason if they can buy it cheaper next week there’s no reason to buy now. Basically the only thing keeping Japan’s economy going are its exports of cars and electronic components to China.

Australia is booming, but look closely and you see the same buyer. Australia is making a boatload of money selling its minerals and raw materials to China (Australia is fast becoming one big Chinese mine shaft). The Brazilian economy is soaring. Why? Exports of wheat and cattle to China. Middle East oil producers are getting richer. Why? China’s insatiable thirst for oil.

Elsewhere around the globe the picture is as uncertain. Much of Pakistan is under water. Much of the rest of the Middle East is under tyrannical or corrupt regimes. Russia has suffered such a dry spell it’s hoarding wheat. Despite its wealthy few, India’s masses are still terribly poor.

The stock market could plunge tomorrow or the next day because the world’s economic fundamentals are so precarious.

The global economy cannot be sustained by one big, voracious nation – especially one that’s suffering bouts of civil unrest, actively repressing dissent, suffocating under a blanket of pollution and coping with other environmental hazards, and whose biggest companies are run by the state.

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